Simulated large-field soil and solute transporting system

Abstract

The invention relates to a large-field soil and solute transporting system and discloses a simulated system for researching leaching, migration and transformation conditions of solutes in the soil under a field irrigation condition. The system comprises a soil groove, a water supply system, a sampling system, a data collecting system and a leaching solution collecting system, wherein the inner wall and the bottom part of the soil tank are provided with waterproof layers and the soil is filled into the soil tank; the water supply system is used for supplying water to the soil tank; the sampling system is used for sampling a solution contained in the soil of the soil tank; the data collecting system is used for monitoring the water content in the soil with the different depths in the soil tank at regular time; and the leaching solution collecting system is used for collecting a leaching solution at the bottom of the soil tank. The system disclosed by the invention can be used for monitoring the leaching, migration and transformation conditions of the solutes in the soil under the field irrigation condition one by one, so that the test period is shortened, the boundary effect is reduced and the test precision is improved; and furthermore, the problems that the indoor evaporation amount is small and does not accord with field conditions are solved by using an evaporation system.

Description

technical field [0001] The invention relates to a field soil solute transport system, in particular to a simulation system for studying the leaching, migration and transformation of solute in soil under field irrigation conditions. Background technique [0002] With the increasingly severe shortage of water resources, the use of unconventional water such as recycled water and micro-formed water in agriculture is becoming more and more extensive. However, in actual agricultural production, due to the lack of continuous observation data at the irrigation site, it is difficult to reflect and quantify the soil environmental risk caused by long-term irrigation in the field through investigation. How to use unconventional water for irrigation scientifically, to ensure the demand of farmland irrigation water and the safety of soil environment has become the main research direction of farmland irrigation. At present, field tests or indoor soil columns are generally used to simulate...

AI Technical Summary

Problems solved by technology

[0003] The field experiment has the following disadvantages: (1) It can only study the comprehensive soil solute dynamic change law caused by some artificial measures (such as saline-alkali land improvement) under natural conditions, but cannot study the influence of a single factor; (2) Field soil texture and background Due to the heterogeneity of the value, it is necessary to arrange enough test points and repeat the test many times, and the test workload is large; (3) The test cycle is the crop growth cycle, and the long-term cumulative effect cannot be studied in a short period of time.

[0004] Disadvantages of the indoor soil column: (1) The diameter of the soil column is small (the diameter of the domestic soil column is generally less than 50cm), and the influence of the boundary effect reduces the accuracy of the soil column simulation; (2) The indoor evaporation is small, and the water in the soil column decreases. Infiltration depends entirely on gravity, while soil solutes infiltrate with water, that is, solutes completely rely on gravity potential to migrate downward, which is inconsistent with the actual field conditions

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